Ultrasonic, infrasonic and audio waves travel through a medium with speeds $V_{u}, V_{i}$ and $V_{a}$ respectively then,

V_{u}, V_{i}

and

V_{a}

are equal

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V_{u} > V_{a} > V_{i}

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V_{u} < V_{a} < V_{i}

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V_{a} < V_{u}

and

V_{u} \approx V_{i}

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Solution

The correct option is A $V_{u}, V_{i}$ and $V_{a}$ are equal
Velocity of sound wave in a medium is given by
$v = \sqrt{\frac{K}{ρ}}$ where K is the bulk modulus and $ρ$ is the density.
The classification of sound waves based on wavelength( $λ$ ) is independent of speed of sound in the medium( speed depends on properties of a medium).
Hence, $V_{u}$ , $V_{i}$ and $V_{a}$ are all equal.

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Ultrasonic, Infrasonic and audible waves travel through a medium with

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v_{u}

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V_{a}, V_{w}

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